Summary

No pockets?
Need both hands free?
Boss calls while climbing a tree?

No problem, here comes the iPhone 4 Necklace ;-)

Instructions

At first I doubted that this can be printed at all,
but the finished part came out surprisingly well.

It still might not be printable on every machine (holes, overhangs).
I used an Ultimaker, driven by Cura and used these retraction
settings:

The STL model has some intersections and might cause
some warning messages with some slicers, but this will
(should) not affect the print.

WHAT TO DO:

OPTIONAL:

BOM: